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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '810883d2941ecbcad7c0059b96d740e1bbf004237287f1ea262bef4e49798a0f' 
  AND token = 'NMwq5+HvWXY2Ox8mFd7UsnyQtrITKnF3MkF2LlfC0lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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