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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '096728a0dca7d3cc97ada9f576fc5e6e3e8fcdfd3b2bbb2619e587245f999ccb' 
  AND token = 'apTo1idvY7C8jcWr9t9w6ytKkY0jn4pWSOuv/O5vBHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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