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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd84fcd600047ecf7d04bb33b56bda4244993b29a21a4e46b26b14e038c68369a' 
  AND token = 'jmq3EsR+riWfIsWz0WKQ0N2H+obveepHQE1Y+WuS6NM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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