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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f29dd85350af24c95e2dd3165a5ccc64f24ab6a7c6b4fae1711c437aa2f4b8a6' 
  AND token = 'KJpoKlt0aLp8KR+mnDqfiB68pwIoB8W0jvEyx/eUnpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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