SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a4679eb5f18ce7228061f7f127ce588f379c09db12f8310d1138eb41adcff7d' 
  AND token = '6OLzM/kXZVelCJQDLX0pIGjZzbJdvsFyFWrJeKCQRhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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