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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f575a4acb4e888530acd976f362cece2a77932177e4580fa46f22ad588ee582a' 
  AND token = 'zSOoJLqxiLyK6VENkN3zTwlMxhDDbn95ZEzKLf0DLsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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