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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '682e48fdd559b57809d5a32314e61b1c34e1d29cc8eaf63e5fd152b82999a309' 
  AND token = '704jsj9Ic5IYlxsHeGHVRuMhV5G7Vl0ekhV6SFqxyMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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