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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3df8e86d16b06e8047f4d8066a09c6dcb204ddba1f431ad0e6a4e775fdf06354' 
  AND token = '7mTFpZS8MNb6OEyW/uOSwfXQvdIkf63gOAkFJKSTN1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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