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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3e73e6727c31116b0681b8ef316fdffb06d92708cda7eea59f2a8687d8d9076' 
  AND token = '5Y2GrzzO/7SHR1Qqv6rHva/bN4o1h3oeCdCZ89o8dKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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