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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dbfe51dfa9be301695c14981ac5bb6060979efcbd29cd8fc35fa0e484c73588' 
  AND token = 'Y+7m6Kgo47/O0N4dDpmmMUncbcuN0VXKxCIQp9UbC8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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