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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da12f13e2909e772e061e95b8bbd11ec468cf73d3c826d353e0b06216450309b' 
  AND token = 'scI67Mvht2+TW6EJAJ/1H2A6/WpHb74uEongE2j7TAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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