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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af98b50c5c61cffcd7bfa198762e011355dd33cb1c1c62ce7a950f61701e657b' 
  AND token = 'z42LnYOCtd95/2Y+ehShhoaUbF8H1KWXjoUes62TDhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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