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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '270793f935d36dec7176dbc728388d19da67ef29a8fa5f123a4b5caf789c7627' 
  AND token = '5XCUrxg06+4+GJDfJbg1GhvQQaASwtG22iWwXGU6mok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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