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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7f762abb8730618a4489d6d82449fea88c931454f5b036206f12e80e53e787d' 
  AND token = '7hCVfo64hQwe42YGE0qYXRV5iA7GHwy7NKSnXiBmJQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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