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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f377a56f3184fbe5719f42b227637e81fd88e0da1ed21e54f5e306f66eaf0754' 
  AND token = '3nOz9m0qiLpqjnmMtjnI0nhwv5K2c3HOfuCGlirs1ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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