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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78edf4c0ddb6bb116539a80e660651e3b870617d73f90d97b559c6f3a41ade6f' 
  AND token = 'Z0CfsFoN4BbqW9Ip7u1k7UvqEWMs1kDT5cAfprZbzrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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