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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '081d0922a303ab3d0746319ce576d3faea9b3a3870db0e453a732b1eb3d5093b' 
  AND token = '0stLtGXORPQZBP/t7sdebjbNt+1xVyxC0hlpxq5fll4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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