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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c928bb99584a7f1d07d58314718c7cede49ac5c6ee31a23feef1a1728f260c3' 
  AND token = 'Xj6gipn3eZvPt6y9Id2tUtMhPch/IDLOEDHNWubwDZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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