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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2baa85d8fd4474d816bff1b976cac92094eb6d7c5ff3c07a9728f31eb674751' 
  AND token = 'X65tkVyIr2BwD45yyPofpyjKRzUw65DgN554vAqkvrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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