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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1213c501d81390dd881e95f5cad5b63561f259eedf0257ffe84e7c253713770a' 
  AND token = 'nPB0cK6UqlModz6brfqhdWcYAORZuK5pfIJ/oU6t+YQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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