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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a8b9650cf9c56185bc6256b041db32efd2f40cdb8c3f2bd8ed539b4f8131151' 
  AND token = 'rlJ+cFpQHzEPutkJPDdo9ob5R0h6GuQ4PR0/x7C/8Yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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