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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07edc7e58945167abd7053447c40d9a00fde72a8e9e0ac06f861314ec8a30d1c' 
  AND token = '8eGqz7rksoUZhMKeDIZO02ZM0fsRWcRmYEoI4W42yjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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