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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14b91d942a517aab49890d7bbc931d62552ed145bf9c64ecf32bb6485230cbca' 
  AND token = 'aaGybrm99V4Vm3uKy6I7TZ/qVy5Y+q4g8pjIi5Vg/a0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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