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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ccc0cabecbd95cf14a5d1f24935e95214df137f75d2cda2ab88834e89278e78' 
  AND token = '0GD72Sg9y+InIu7ZNm40qVLt/Zha4t3cGzp9V8z8YhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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