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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecae4c6d3ebe7253b14bc44edc03f0c79c53b4b3dddaed368ed2d44fd03d9e1b' 
  AND token = 'yaA6IUbTZbGin8GSGwY9RdJq7KV+dT+AI3dnUPz7zyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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