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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd801ad8c4d91e06009af43ccf5612636c573384a7a3394dd724d1df337448d63' 
  AND token = '4HBp9tdnxgzzFINr2vgukzOPAmUs3VuOYGKrAfKhaQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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