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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56a978c7322d01f561dc051b017c9c8fe11915f60b6946e7bc00de4c93794176' 
  AND token = 'm4RnraGjHID3sl7nsXeIqZnE1Z05SYZMtR9vdONqCyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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