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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '340ee91a6cc7cb298b45d2e889f790cc2b7edc3bc21f99995c42c3e2a2d1d070' 
  AND token = 'zJ5+K8hs3IENjuRfKbcZjVuyKIXuZZXqkKw83E0p6Z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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