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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5e1c4c40ad247b8dda763b05605d5b9768aaf3d39b364ccc054238bf30cb41c' 
  AND token = '5inzUYoHOalzEnLFEaPSyc/Ka1qM31JBvLRw4oSkILw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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