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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c84b361c96244cc11040763835a408290ab595bedd989b4e5e389fdd291c715' 
  AND token = 'YKvJKB2kU/6PBZOA7grW9D25BqbECxkkSZ2MtlahxpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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