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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e2847ec1a5b76b8805de1dca1c6d8fc8d0de4d80b80a6031f346a3491de9ef0' 
  AND token = 'yLCpA4mna6vGQHpVJNJgZyeZZsgtfrbImO25slH9fDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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