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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f5d2bc74446748b373a8649822a6473b1a471a2ec6eae7c93ef1678269f6fd4' 
  AND token = 'TjWJ6tiKHbS1rsKpny9gPhzbvu4KHxH+xupo2v97U40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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