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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb32dbaea25aeaddd52af308274b8c92070652dd995b33cf52ec0f4384b13cc7' 
  AND token = 'CBUYkA6FX4XnQmggUMoNI/4EcH7AOqdHfEH1ZlK9mDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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