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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7f17acc5ecd5b0bfa69b9a8b765a2a47ddb1d08ad9712b722d61c91cfcbf783' 
  AND token = 'IKRSd9bGsC5i/+ZKID8yXD7RrT+9gdEzZ40xQSO39gM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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