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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff6753133c76cac5c3970d6713b2e18e9dd8f2b04f300e7d1d769ba30d695352' 
  AND token = '+Nh4aeKTGR03TGBKKBYxXUt4c9Wd9WBYc9GKJMBC32E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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