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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3886e57af66d71cc7d952e3038265fa3fcf47af0e5a3dcf020218cf131c3585' 
  AND token = 'vtLEDjZcj6MysSi3yAkdaaqHQ1Juxq55ePSLYAM1OXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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