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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a5df4fc1bf8b384a17e2a05d6cca477b15ee4b08492fdf1c1b23dd5d3c5f5bc' 
  AND token = 'lSY0RxevniEbBaYVExwHztfs3+/4F7ELy00dyhyrQRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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