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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f6e7b4463db058e18ee7fd427c072684e99a08ee6bc411ab265468f464a9c30' 
  AND token = 'CQLUpgGCH1g94yn0ii/cSf/zZy5ODgyf0PWSFn726eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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