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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75de3233bf310599546b1a5b5d2445b74e72019ed8b5814fc70603d31f836951' 
  AND token = 'I4ckTjBfvypu61kq/eD7yS++u4YzVuaC8bKNjl53xoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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