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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '626d19c462c3aa24f63ce644c84c7337a27467e8ae7ab333884b29422d8a3ad5' 
  AND token = '9mt1SkCUGwpLvzGjldEU9rnKPCqODyrCTNG2prQk9jQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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