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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee2d80079b5d7598e2c4781f6c13df327f864ad8b66b94dbf50fab9a3b3ce8b0' 
  AND token = 'PoOEGIjED1DK/9xGuWWI7McAs7vys4BgHP11VlnkcYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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