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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cebde5413646b4a98d9a3e779d2a4dc90708659e7906bcafd54ac3d236f0b418' 
  AND token = 'jPKR9ZWohUo1oNqoSrX7FJsWkaZT78DqBxPpRSb4Dj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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