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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf037974cd052978b8a843d76852417742155c305e5db89d89e3df527e30e55c' 
  AND token = '8NKMnE7OLTs47P8ntPg8qVG0WLns2LI32ZPili6KpTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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