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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd18f8ed1081cb261f092096f6f90fd720039ebb10b1ac36662c7fbde40adc21d' 
  AND token = '9ltK1ydAu34FwxtumQsHz4kkgPQXlsXqMIduIVggSfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}