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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a7f7ca53a231717f36f969e399718af122285962cb031899d6839d1b8c0626e' 
  AND token = 'JiP1TX1/s7Pq2U3X0lIMrIi5SGghmzms2zlaXUmwUrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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