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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c68422fa9b8289286536c01185a59edd0c12fd3516c96d0a19df5bb56466627' 
  AND token = 'xCcgvK4tfV7/sJBGis959bevckjvnCjvl0EP4D7wbas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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