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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72543e2269e81d61b3ed6545cd998008dc231c1dd45ce575f6f8c17f2c269a99' 
  AND token = 'T3EIqOtRlWnuWN2ljYxy1UtkdBz8/XV+e8tO2Ot2slM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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