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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55ca42310eb9ac849c65c4118a02b721a6a0889e732e561753ca2f2c758dbea4' 
  AND token = '0yuXfXkwuP2QcZMKbGqV53tjHre8WTHyQe+AJxgNFzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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