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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd025ea5917148f53b3660599e529c2e066c21086930129b8f85fb1569b4eafd' 
  AND token = 'kGt4i05Mt8Aiu/HtjQ8wd15gfmYGQH1KqMWOYp9jwXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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