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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '467553ac0c1baf32bbcbba04fa77f871643d60d319ec559aae9caa643aa4f9ba' 
  AND token = 'w38Th793IR8IWXEVx41Y9pTJlaDLOd78gX/J6jeMpXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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