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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '524ea5160307d2b4ac27669d3d80b252cbe4e26239d9374589391fb68b68b810' 
  AND token = 'Cslu3q6j0HYUBWFKFVlGcf1T2rfmSTdowXdB5SvSrk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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