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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fea54847d32fb9514198e433ae120f0e2a3b2561e4fb81eefe780a83e4fc572' 
  AND token = '8Eop/seEeWFd3fcdu85l+CDJBirwkWC95ONDlrTn/54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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