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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac60acf881302a6861683a95c194d8de99e1f64733353caf9b60a41b32404493' 
  AND token = 'S8j/maRiZ46sPdFZpWKIuOjp1l5wloMbjozh2GvBdI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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