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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb4fcbd3bc9a42758b1c9ad275a07d744a57aaad0258c51783eb9df9f782882c' 
  AND token = '5Ob+Ohir3MXY+DEQIQtJNx4zEsVT94zuf4nOZf4Ti5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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