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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee824a685ee01e45acb9906402e54b32123f9b83ad1306c6f891638a9ccd2550' 
  AND token = 'gCBhPKrWs7xkQI5W9SfHL7Ip58ErNvGhbva3BsZXS0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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