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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fb9edbb20ad9bced790e41cb71463cf2c482bbfbddad515004de15a4ae1ea98' 
  AND token = 'THTNiMPbRScDzMeSs8JfQcFOPO6qcRvgcQ/k9XvCejg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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