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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6be08cef23ce485d49b42c7afe2009ba1e496a10a3dd905d0e4ab84198eb280' 
  AND token = 'LdaK4FWh2Ft2JhlFnltYxmk204pm+qdqOjyc9S+X7bA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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