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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef24af2dcb4b8496c41110c480292abbe4f6a1bf97918a2d1e85cd13fb204d1a' 
  AND token = '6SnR1AWVlsc5tX3Q9NGbkq4XMkQ8FAKezdpISPQSH5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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