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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '846183deb7572c6549b2a86347a24db657f8a1fb81a24bc018dde6c3f9f10717' 
  AND token = 'RWJLLYgDO0aqPtDXQ9y1TUWWnijiCRG1ltiD5rTE9k8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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