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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3873b7d3843222b115f995b49d83a30424907509019a34f8cb59b6b1cb30ff44' 
  AND token = '7BWhza5S5U9fuTciLlDvDkKNAR6yKiLT2FdkN3LgUac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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