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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ada631d33e6064cd11e636a9d92960d7f0494d7e6df919eb9801d8e48284a57' 
  AND token = 'wDQ0OqhV/ovDcN6bq7alhN3/H64o0wOLEG5LBIYXefw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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