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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c62ff40491766dffded307fe46a3a24dacadf0b5edc89a3dae7ed925e9bd4fb' 
  AND token = 'PwtH2d7zut2DlAuJpIT6SKG5BhH5aN8F583zgnFCbC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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