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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a06ee634e114696fa99e0952a2b16943d34741903898ef230a67f8cb684e026' 
  AND token = 'qhpOZSM0bo+qoxNOEBLkoQMOUcwh7fEeRFn3bW94pUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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