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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76fe13acd4642744b1e746c160064e6ac4e6b67614f2a9cef04e416ecd6f0e21' 
  AND token = 'CP4Jig3hQHFRlvS34F6UxXenkKfhwhK35q1PUbyF6B8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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