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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3643ec665882f6fcc9674d06c9f2666ec03bfe41aa882a55d9b8befdd047685c' 
  AND token = '9iJrK9Qb3049Ni5eTPZf/L+Vh6Wy1sE7kRzIgQJ/82Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}