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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd7eeff3bfb8ccd60ed1fcca7f36d1ff06462ebbab552ca731be5b9f10a96e04' 
  AND token = 'WZfbkXv4gmZbr4kDBmlUxF9l1IZZr9WHHpf+cRK3uoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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