SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19185389efb20c83bfa46b6db62f3ff35cab28d2f870e8c945f01735ba9697ac' 
  AND token = 'Z+P01gQCM556xEVkJeKBLrQ/kgtey90u8pNHhFlZBW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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