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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb9a6592a4535c0752fbb00710b3670a3c26b3be98cd687581a6d54899980f17' 
  AND token = 'ShZL66wnplncxODzQIbR0hVTlqQE+kiinYAx1Je9qUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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