Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc8425fcc12181c987e9138522bccebc1a9de7908c1da0380c8684d0e854ce84' 
  AND token = 'UzQ8zVdN2FJFjBypmcNEehUz3BMcerC4jDgfvVjZF8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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