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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a08c40be530b94f98e91475ffd760365d4925d194b60fcbdb6f745c41552896e' 
  AND token = 'rP793NzGnpKF44k06kcPx8XpSdqbisTfwjPgzVGyy9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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