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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dff1934d15fbe5ee8a8dceb64791cf30c2787dde656303ad274194b7fe441baf' 
  AND token = 'WZO2AcviGbpz0wSNZ2CoXl+HPXrn0CFEMLPl94NkcEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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