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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35a30d54113096671300c55e3370fa41fff3bccc8bfee1cc1325584d6f47fb33' 
  AND token = 'qCPSYY9QRkyqTQdT4BR/CuDapJ6h9ABID9QHfZnRwKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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