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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dbc017cf130fd3d59b63da15dfec8808662af294bac6b4bb2daeb66ad96b8c6' 
  AND token = '4GDZTWa/F4oky2ef/NyGok+bLcFndcOwCRjsZ7OS0pI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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