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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7f253a9d05eb3e7b6d2bd75d37675f0cbd96013da9e74d0ac6c44c6e03ee83a' 
  AND token = 'U9bySSR+RnXULE1MnPxoh2iivWEICQA6V3hVjAcy/TU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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