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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8961b142902cc081b373e0ceb53654f6885494bded888be2f8d6099937bcf6ea' 
  AND token = 'SGoeDbhtPbiI0k9hy72z60Rv/BLgE9tGTWzVEK619Jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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