SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82de3303b93db22cdbef8f4a0a91ce8520481349f3bb9d87fc39c39c764227dc' 
  AND token = 'qMd4yaGRZ1+E2QbIuU4P/pKywizC/HW2fYjmYO6DBNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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