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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc69c8f5ccc6439701ef591e8d0c3f46e08c566622f753993a16e62247304c5a' 
  AND token = 'zccjD55BLiOBIxciY06basY4FqK6CBx1pa5Uf7iqNU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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