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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0cb7c98b0702ef0dd9c84f8f58dcea0a01ba4ddfff7a521bc78bbdbeb13ba15' 
  AND token = 'BR9nPvL06pgjJy8C4eWsL/S2vKi9O7wr0oLHHQIn06s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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