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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24972ba8eb502379d9f6b52553906b31ab0c7290e6a8f20a88fc2ba77d652efa' 
  AND token = 'NXlTwUl9v9elgfu0B6BefUGlK6oDfyMDHGfDSOgfO/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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