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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '869234510a4d9f4e1a7e1c880b26a0ac4deadcda4a688cd44fd0e75fa9c7c0dc' 
  AND token = '4IKyEg9BL187I8s4Up8yV2JCoaOnNxJDG89GXsRlufk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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