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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2919323600d7632419e30284637f35bafc61fd164587c66e0d0ea08ab8f71510' 
  AND token = 'rwLJ4paQ0V14336xaz0Ca3yopgu9e6gNu9E1rGsf/Mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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