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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7db90b253f04f9a4b1ff507db0d21fb1dbd622cda175d56bdbd3a00c75851515' 
  AND token = 'Pk/ge5dVU5inRgFyIAs9NMVe8b26Zdy9Ysy8YR0kofE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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