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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '674f25de3a666a572deca5e2dc5950ee5c61ec53276b9fff88597ed8b5f9bcad' 
  AND token = 'hEa+wfW//YZ6901Jz/QpHiJDIdmPsWWwVnI4FFeOpUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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