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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ac55bce7979a650f76cd7ae1a11b8842ec367b042a519de9a03c45c646f06e4' 
  AND token = '7IRcWGmPTYlonrYvoZU5aXEDFUmA4nAmvqGnjy1Nl6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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