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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe41da8c208d15fe11b156a41e3f80714488dc636edf33d748c90745512fc43d' 
  AND token = 'CckG7HdZgwaN6PbQzKBDtOzOFE5PTBkPiuMXe9MXlz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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