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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9daf7326ce0e5cc297f86b4aef5f690ddeba002a980ad00b4dc0c1e241a2933c' 
  AND token = 'iub5IlaBeN/XhX+/C2uZc5heOPdjJrU3Qnzcjto5hWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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