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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af1e20b47b381265bb7ba03f4af96cc561d4fd51d762361280b0d93f7bee8592' 
  AND token = 'nLEOzql1KUq0EYEcyT3bXz+msRKvWZ9fI+PPblQlMKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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