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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efe026905323ad39033c62e3d1557a383cc4d12c9cb982a46ae5c12e7fee55a3' 
  AND token = 'zsKIiUWJzoNczLiZ3qAmjW7J2BXW+xshB5jIMTBaOlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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